Add CI/CD script to detect out of date copyrights

Fix #2535.

Signed-off-by: Steven Bellock <[email protected]>

.github/workflows/compliance-checks.yml

@@ -44,6 +44,7 @@ jobs:
             git diff
             exit 1
           fi
+
   file-encoding:
     name: File Encoding Check
     runs-on: ubuntu-latest
@@ -57,3 +58,17 @@ jobs:
           if [ $? -ne 0 ]; then
             exit 1
           fi
+
+  copyright-date:
+    name: Check Copyright Year
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Check
+        run: |
+          set +e
+          ./script/check_copyright_date.sh
+          if [ $? -ne 0 ]; then
+            exit 1
+          fi

script/check_copyright_date.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Check if the modified files' copyright dates are current.
+
+set -e
+
+# Change directory to top of repository.
+cd `dirname $0`
+cd ../
+
+# Get list of changed files.
+git fetch origin main
+modified_files=$(git diff --name-only --diff-filter=AM origin/main..HEAD)
+
+current_year=$(date +%Y)
+exit_code=0
+
+echo
+
+for file in $modified_files
+do
+    # Only examine C files for now.
+    if [[ $file == "include/"* ]] || [[ $file == "library/"* ]]; then
+        if [[ $file == *".h" ]] || [[ $file == *".c" ]]; then
+            # Assume that the copyright is located at the third line of the file.
+            if [[ $(sed -n '3p' $file) != *$current_year* ]]; then
+                echo $file needs to be updated with $current_year copyright.
+                exit_code=1
+            fi
+        fi
+    fi
+done
+
+exit $exit_code